Multiple sets of an exercise are preferred for advanced level or advanced weight lifters. Multiple sets of the same exercise help to increase strength and muscle. It is beneficial for all those people who are seriously trying to build muscles.
Multiple sets are more beneficial than single sets because you can lift heavy lifts for more repetitions without exhausting your muscles or getting injured. It helps you push the same set of muscles that may increase endurance and stamina. Studies also suggest that multiple sets are better to gain strength, muscle endurance, and upper arm muscle growth.